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Chapter 17 & 18

TermDefinition
Element Any pure substance
Aristotle believed in what 4 elements Air Fire Water Earth
Alchemy Included aspects of chemistry, philosophy, religion, metallurgy, medicine, and art
Monotomic elements Have 1 atom in natural state
Diatomic elements 2 atoms in the natural state
Johann Dobereiner placed elements in order of increasing Mass
Dmitri Mendeleeve Arranged elements into what became the modern periodic table
Periodicity repetition of certain properties at regular intervals
John Newlands Arranged elements in order of their increasing atomic masses
Henry Moseley Discovered how to use X-rays
Metals belong to families with relatively few valence electrons
Non Metals Hold their electrons tightly
Octet rule atoms generally are most stable when they have a full 8 electrons in their valence energy level
Electron affinity deals with the strength of attraction of electrons to UNBONDED ATOMS
Electronegativity deals with an atoms ability to attract and hold electrons when BONDED TO OTHER ATOMS
Covalent bonds Non metals share electrons
Ionic bonds metal/non metal electrons taken not shared
Meatallic bonds Metals share electrons
Created by: hayden1223